ci: set up dependabot for GH actions

Signed-off-by: NotAShelf <[email protected]>
Change-Id: I890272e62db5824a3d866748375d1a9f6a6a6964

Author: NotAShelf

.github/dependabot.yml

@@ -0,0 +1,14 @@
+version: 2
+updates:
+  # Update Cargo deps
+  - package-ecosystem: cargo
+    directory: "/"
+    schedule:
+      interval: "weekly"
+
+  # Update used workflows
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: daily
+